[KYHAM] 2 Meter Antenna Question

Tue, 25 Jun 2002 10:11:12 -0700

Hi Mike,

The easiest is a variation on the zeppelin antenna or zepp called a J pole.
It can easily be made form a length of inexpensive 300 ohm TV twinlead.  The
overall length is 3/4 wavelengths.  One end us shorted together and one
conductor cut away and removed 1/4 wavelength from the shorted end. This
provides a low to high impedance transformation, which drives the remaining
half wavelength of single wire at its voltage feed point.

Ideally, it should be fed with a half wave coaxial balun, which provides a
200 ohm balanced source.  The resulting 200 source is connected to the
twinlead at a point that provides proper loading as shown by highest filed
strength and or a proper 50-ohm match to the source.

A simple alternative is to ground the 50-ohm coaxial source to the 3/4
wavelength side and attach the center conductor to the 1/4 wavelength side.
The point of best attachment is usually a couple of inches from the shorted
end.  Some experimentation is needed to get the best match consistent with
highest field strength.

This device can be placed in a hotel room in a hot spot and the 1/2
wavelength end suspended by a length of monofilament fishing line in a
"hotspot".

Good Luck and let me know how you make out.

Dave W8YZ

David Smith W8YZ
Technical Coordinator
Michigan Section ARRL
Monroe, Michigan 48162-2943
Phone 734-242-5589
Fax 734-242-8413
Cell 734-479-4686
E-Mail: [email protected]
OR: [email protected]
Please visit our websites at:
http://www.arrl.org/sections/index.html?sect=MI
Or:
http://www.msp.state.mi.us/division/emd/staff.html

-----Original Message-----
From: [email protected] [mailto:[email protected]]On
Behalf Of Michael Delaney
Sent: Monday, June 24, 2002 9:47 PM
To: [email protected]
Subject: [KYHAM] 2 Meter Antenna Question

I am going on a trip to Florida next week.  I intend to take my HTX 242
along for the journey.  Can anyone suggest an anenna configuration that I
can set up in my hotel and can be packed with the luggage?

73
KG4OWE
Michael Delaney

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